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Revenue (Provision for Doubtful Accounts) (Details)
$ in Millions
6 Months Ended
Sep. 30, 2021
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning Balance $ 6.5
(Benefit) provision for doubtful accounts (0.6)
Uncollectible accounts written-off (0.1)
Ending Balance $ 5.8